I have a 60 inch 28 hp EFI and today while I was mowing my blades shut down. After a few quick checks I took the fuse out for the blade switch and it was very hot. Hot enough to have started melting the plastic around it but the funny thing is that it never blew. I stuck it back in and the blades started working. Do I have the wrong amp fuse? The one in it is a 15 amp. Could I have something grounding out? Any help would be great. Thanks.